Old Motor Replacement

Are these current ratings as observed?

As per these values your Full Load power is just about 500KW.

Try to know the connected load and its demand (KW) at the full load condition from your existing motor and then only you can select the motor. However it is always preferable to put a higher size motor, since in your application, your starting torque requirement will be quite high (bringing the mill from stand still condition it is mill isn't it?)

Better may be to put some pf compensator to improve the pf and that itself will improve your performance.

I have seen these (larger sizes) fitted with approx 3MW SQIM when the demand on FL is only half of it.

the current ratings are observed for this motor used for sand mill

i appreciate your ideas as it has to be reduced to a lower KW.

further the motor originally had a feed of 45 tons per hour that is now reduced to 7 tons per hour. media used is stone with arm of gravity about 0.609. and sand mill length and width are 12.87 m and dia about 2.3 m respectively

Regards,

Ahmad

Electrical Engineer

Cement Factory

You need to give us the load at which this motor is opearting, Load current and other details.Otherwise very dificult to make any suggestion

Dear Nesuba

I have mentioned earlier that the motor is running at full load current of 54 A

and motor runs at no load of 42 A

If you need other details please specify

Regards,

Ahmad Mukhtiar

Electrical Engineer

Cement Factory